Of 83 counties in the Wolverine State, Ontonagon County ranks third by size (3,740 square miles). Ontonagon County is in Upper Peninsula Michigan. Ontonagon County, Michigan, has 1,000 acres of recreational land and property for sale based on recent Land Network data. The combined market value of farms, hunting land and other rural land and acreage for sale here was almost $500,000. Browse all recreational property for sale in Ontonagon County to find the recreational tract that suits your lifestyle needs, from hunting and fishing properties for the outdoor enthusiast to undeveloped acreage ready for future residential-property development. The most common type of land for sale by combined acreage in Ontonagon County is undeveloped land.